CN1218055C - Therma processing method for crankshaft of high-power engine - Google Patents
Therma processing method for crankshaft of high-power engine Download PDFInfo
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- CN1218055C CN1218055C CN 200310105476 CN200310105476A CN1218055C CN 1218055 C CN1218055 C CN 1218055C CN 200310105476 CN200310105476 CN 200310105476 CN 200310105476 A CN200310105476 A CN 200310105476A CN 1218055 C CN1218055 C CN 1218055C
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- 238000003672 processing method Methods 0.000 title 1
- 238000010791 quenching Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005496 tempering Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 230000000171 quenching effect Effects 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007812 deficiency Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention relates to a quenching and tempering heat treatment method for high-power engine crankshafts. The quenching and tempering heat treatment method for high-power engine crankshafts comprises the following steps that the engine crankshafts are put in a heating furnace and heated to 830 to 850 DEG C; after the temperature is kept for two hours, the engine crankshafts are moved into quenching liquid with the temperature of 20 to 55 DEG C, and the quenching time is from 6 to 8 min; the quenched engine crankshafts are moved into a tempering furnace and heated to 640 to 660 DEG C, and the temperature is kept for three hours; the tempered engine crankshafts are cooled by the air. The comprehensive mechanical performance of the crankshafts is increased, and the flexural deformation deficiency and crack are avoided; the quenching and tempering heat treatment method for high-power engine crankshafts has the advantages of convenient operation, simple equipment, economy, utility, reliable technique, stable quality, etc.
Description
(1) technical field under
The present invention relates to the modified heat-treatment technology method of a kind of high-power engine bent axle, belong to heat treated technical field.
(2) background technology
The high-power engine crankshaft material mostly is special-purpose 42CrMoA, needs modifier treatment after forging moulding, and comprehensive mechanical performance is had relatively high expectations, and sampling point is at flanged end, and the axis of sample is positioned at the sixth place of diameter of axle diameter, and the main shaft diameter run-out tolerance is no more than 3mm.Because this bent axle is complex-shaped, the sampling point sectional dimension is big (φ 123), the horizontal positioned heating, and after oily vertical quenching of employing, quench-hardened case is more shallow, can't satisfy the mechanical property requirement of sampling point, and run-out tolerance is overproof; Water vertically quenches, and quench-hardened case is darker, though can satisfy the mechanical property requirement of sampling point, tearing tendency is very big, and scrap rate is higher.Obviously, existing hardening and tempering process does not satisfy the technical requirements of bent axle after modified, can't realize favorable economic benefit.
(3) summary of the invention
The present invention is directed to the deficiency of existing bent axle hardening and tempering process, provide a kind of simple and easy to do, technology reliable, steady quality, can satisfy the comprehensive mechanical performance of bent axle after modified, can avoid the overproof and rimose heat treating method of flexural deformation again.
The present invention is achieved through the following technical measures:
A kind of heat treating method of high-power engine bent axle is characterized in that: may further comprise the steps,
1. quench: with material is that the engine crankshaft of 42CrMoA is put into process furnace, be heated to 830-850 ℃, be 2-3 hour heat-up time, be incubated after 2 hours, moving into temperature and be 20-55 ℃, concentration is in the AQ251 hardening liquid of 10-13%, cool time is 6-8min, and the stirring velocity of hardening liquid is 0.5-1m/min;
2. tempering: the engine crankshaft after will quenching moves in the tempering stove, and Heating temperature 2 hours heat-up times, is incubated 3 hours to 640-660 ℃;
3. cooling: after the tempering engine crankshaft is carried out air cooling; When above-mentioned heating, quenching, tempering and cooling, engine crankshaft is all vertically placed.
Specifically describe below:
(1) special tooling that is complementary with the bent axle geomery of design is vertically placed in heating and process of cooling to guarantee bent axle, prevents or reduces flexural deformation, and guarantee to load and unload bent axle safety, convenience; The size of this frock designs according to the particular case of heating installation, to reach each loading bent axle as much as possible.
(2) select economic and practical process furnace-well formula resistance furnace for use, to guarantee special tooling and the vertical placement of bent axle in quenching and tempering heat-processed, even heating.
(3) according to bent axle comprehensive mechanical performance and diastrophic requirement, the processing parameter of design science, select rational quenchant (AQ251), concentration range, use temperature scope, stirring velocity, with enough quenching hardness, the case depths of acquisition behind the assurance crankshaft quench, and can avoid cracking and be out of shape overproof.
(4) quenching tank that is complementary with process furnace productivity of design and circulation, cooling system, the quenchant on bent axle surface has enough flow velocitys so that flow through, quench media temperature is controlled in the use temperature scope, thereby guarantees that quenchant has suitable cooling power.
(5), in conjunction with the characteristics of special-purpose 42CrMoA, do not adopt water-cooled after the tempering, and adopt air cooling in order to reduce unrelieved stress.
(6) electrical control cubicles of design is controlled automatically to realize the circulation of process furnace and hardening liquid, refrigerative.
Heat treating method of the present invention improves the engine crankshaft comprehensive mechanical performance, has avoided the overproof and cracking of flexural deformation, has easy to operate, advantages such as equipment is simple, economical and practical, technology is reliable, steady quality.
(4) embodiment
At first, quenchant AQ251 is mixed with hardening liquid by the concentration of 10-13%.Then, the operator installs to pending bent axle on the bent axle special tooling with driving or other lifting tool, after filling by its loading capacity, hangs in the well formula resistance furnace (quench and use), and Heating temperature is 840 ℃, and be 2.5 hours heat-up time, and soaking time is 2 hours.The rapid immigration of engine crankshaft of good heat insulation filled in the above-mentioned hardening liquid quenching tank, and quenching temperature (temperature when hardening liquid is gone in fingering) is 820-830 ℃, and keeping the temperature of hardening liquid is 20-55 ℃, and stirring velocity is 0.5-1m/min.Then, behind the cooling 6-8min, it is hung out and hangs in the well formula resistance furnace (tempering is used), Heating temperature is 640-660 ℃, and be 2 hours heat-up time, and soaking time is 3 hours.Then, it is hung out and is placed into discharge pit and carry out air cooling.Like this, the modified technological process of bent axle has just been finished.During this time, housing is carried out control comprehensively to well formula resistance furnace and circulation, refrigerating unit, and especially to refrigerating unit, as long as the temperature of quenchant exceeds the scope of regulation, refrigerating unit will start automatically; When reaching the scope of regulation, promptly stop automatically.
Claims (1)
1. the heat treating method of a high-power engine bent axle is characterized in that: may further comprise the steps,
1. quench: with material is that the engine crankshaft of 42CrMoA is put into process furnace, be heated to 830-850 ℃, be 2-3 hour heat-up time, be incubated after 2 hours, moving into temperature and be 20-55 ℃, concentration is in the AQ251 hardening liquid of 10-13%, cool time is 6-8min, and the stirring velocity of hardening liquid is 0.5-1m/min;
2. tempering: the engine crankshaft after will quenching moves in the tempering stove, and Heating temperature 2 hours heat-up times, is incubated 3 hours to 640-660 ℃;
3. cooling: after the tempering engine crankshaft is carried out air cooling; When above-mentioned heating, quenching, tempering and cooling, engine crankshaft is all vertically placed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105476 CN1218055C (en) | 2003-11-03 | 2003-11-03 | Therma processing method for crankshaft of high-power engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105476 CN1218055C (en) | 2003-11-03 | 2003-11-03 | Therma processing method for crankshaft of high-power engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540004A CN1540004A (en) | 2004-10-27 |
| CN1218055C true CN1218055C (en) | 2005-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310105476 Expired - Fee Related CN1218055C (en) | 2003-11-03 | 2003-11-03 | Therma processing method for crankshaft of high-power engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1218055C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363513C (en) * | 2005-07-19 | 2008-01-23 | 辽宁五一八内燃机配件有限公司 | Heat treatment process for large microalloyed medium carbon steel engine crankshaft |
| CN102329943B (en) * | 2010-07-12 | 2013-07-17 | 中国有色（沈阳）冶金机械有限公司 | Thermal treatment method for large electroslag smelting cast 42CrMo steel crankshaft |
| CN102399967B (en) * | 2010-09-17 | 2013-06-19 | 上海重型机器厂有限公司 | Heat treatment method of eliminating overheated structure of crankshaft forging for large-scale ship |
| CN102115809A (en) * | 2011-03-04 | 2011-07-06 | 河南科技大学 | Environment-friendly heat treatment process for large shaft forgings |
| CN103131825A (en) * | 2011-12-02 | 2013-06-05 | 天津市三焱电渣钢有限公司 | Quick heating quenching technique for electroslag smelting casting large section crankshaft |
| CN102989954A (en) * | 2012-08-22 | 2013-03-27 | 昌利锻造有限公司 | Forging method of excavator engine crankshaft |
| CN103911492A (en) * | 2014-03-10 | 2014-07-09 | 苏州捷德瑞精密机械有限公司 | Heat treatment method of elongated shaft gears |
| CN113969334A (en) * | 2021-10-26 | 2022-01-25 | 山西柴油机工业有限责任公司 | Heat treatment deformation control method for medium-frequency quenching of high-power crankshaft |
-
2003
- 2003-11-03 CN CN 200310105476 patent/CN1218055C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1540004A (en) | 2004-10-27 |
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